Cut locks on three hatches along the Hultman Aqueduct in Framingham prompted a large police response Monday afternoon, The MetroWest Daily News reported.

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State Police blocked the access road to the aqueduct just before noon as members of the Massachusetts Water Resources Authority (MWRA), along with detectives from the State Police and Framingham Police Department, began investigating the scene.

MWRA spokesperson Ria Convery said the cut locks were discovered this morning and that the hatches could not have been unlocked for long because the MWRA conducts regular checks at the aqueduct.

Convery would not speak to the frequency of the checks because of terrorism concerns.

The MWRA released a statement at 2:20 p.m. indicating that the water supply is safe.

“There is no evidence that there was any attempt to disrupt or contaminate the water supply,” the statement said. “MWRA’s real-time water quality monitoring shows no change in water quality nor any sign of contamination.”

A Framingham officer was seen knocking on the door of a neighboring home that has a view of the aqueduct trail, which is located in a wooded area on Rte. 30.

State Police said they will be investigating the incident but do not have any additional details.

The Hultman Aqueduct is one of two main transmission lines that carry drinking water from the John J. Carroll Water Treatment Plant in Marlborough to the greater Boston area.

State Police and the FBI were called upon last month to investigate a case of trespassing at the Quabbin Reservoir in Belchertown, which supplies drinking water to Boston.

The MWRA said the following day that the water supply was safe and that there was no evidence of terrorism.